T
echnical
B
ulletin
PAGE: 2/25
Model:
Taurus-C1a/C1b (D074/D075)
Date:
20-Mar-14
No.:
RD074118
1. White Line (along feed direction)
Excerpt from RTB #RD074112
Symptom
White line appears along the feed direction.
White Line is especially noticeable with solid or 1-dot halftone images.
Possible causes
1. Foreign substance stuck under the development unit scrapes off the image on the
ITB, causing the line to appear at the same location on the printouts.
For example, if the foreign substance is adhered to the bottom side of the C dev
unit, C, M and Y images are affected while the K image it not, due to the position of
the stations (K positions to the far right).
2. Laser beam is blocked by dirty toner shield glass.
If dust/toner is spread widely on the shield glass, the white line will appear wide,
almost like a band. If dust/toner adhered to the shield glass is small, the line will
appear narrow.
3. Foreign substance stuck in the doctor gap in the development unit causes
inconsistency in the amount of developer transferred to the drum surface.
Running the machine continuously in a high-temp high-humidity environment can
induce this symptom.
